Doctor Who: The Newbies Guide
This is the fourth and final story in Season 26. It is the last story broadcast before the Classic Series was cancelled.
The seventh Doctor is fond of mixed metaphors and malapropisms and carries an umbrella with a question mark handle. He is more prone to plan and take proactive action against his foes than his other incarnations.
Ace (real name: Dorothy McShane) is a teenager from 1980s Perivale, London. She is interested in explosives, and has invented one called Nitro Nine. Whilst experimenting with it, she was caught up in a timestorm and ended up on the planet of Iceworld. In Dragonfire she met the Doctor and joined him on his travels. She has the habit of calling the Doctor "Professor" and sometimes using nicknames for other people she encounters.
Recurring and Historical Characters
The Master is a Time Lord and an enemy and rival of the Doctor. He was first seen in Terror of the Autons, where he allied with the Nestene Consciousness to attempt to conquer Earth. He was stopped by the Doctor and UNIT. He has since come into conflict with the Doctor on many occasions. In The Keeper of Traken he had been reduced to a deathly husk and then possessed the body of Tremas of Traken. In Logopolis he unleashed a wave of entropy that destroyed a large portion of the universe, including Traken. His actions were also responsible for one of the Doctor's regenerations.